TCP/IP (Transmission Control Protocol/Internet Protocol) OSI Seven Layer Model This will present TCP/IP communications starting from Layer 2 up to Layer 4 (TCP/IP applications cover Layers 5-7) IP Addresses Data Link Layer Network Frames Address Resolution Protocol Network Layer Internet Protocol IP Routing ICMP Error Reporting Transport Layer User Datagram Protocol Transmission Control Protocol Session through Application Layers Domain Name System Final example tracing DNS transaction through a router Definitions:- Physical network - a collection of computers, communications devices, wiring, etc. that communicate directly with one another (e.g., Ethernet, Token Ring) Host - A computer, connected to a physical network, that exchanges information with another computer via TCP/IP Gateway - A computer that interconnects two or more physical networks and that routes TCP/IP information among those n
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